Every time the weather changes, my car gives a tire pressure alarm. Tired of taking it anywhere or phoning someone to fix it for me so I got this - as soon as it arrived the weather changed and my tire pressure light came on. I pulled out my little gear, installed a pressure gauge, checked and filled up all the tires. Less than 15 minutes and everything was done, cleaned up and I was on my way without having to worry about it later. Very easy!